Quote:
Originally posted by wvsaz
Eric,
Surely you haven't forgotten Du Mont's round metal 30BP4, used in the Royal Sovereign! 
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I remember though I've never seen one in person
There is a picture on Steve McVoys Site:
http://www.earlytelevision.org/dumontra118.html
I suppose it's fortunate they went to glass since most rebuilders won't touch a metal tube. also because of the sealing problems, though that doesn't seem to affect the B&W tubes.